Carpenter&#39;s tool



J. R. MCGLAUFLINI 2,000,773

CARPENTER'S TOOL Filed Nov. '10, 1933 Fig. 4

Patented May 7, '1935 f This inventionrelatesto a marking square for use by carpenters and other workers fcr marking the proper saw cuts necessaryi'n the framing of roof rafters. f 5

In such work it is usually necessary forthe mechanic to layout his various saw cuts mathematically cr-to' use the complicated scales of a carpenters square to obtainthe proper miters necessary to cut on the rafters. atask requiring much time and skill to "obtain accurate miters. 1 1 f The principal-obj ect bf this invention isto'p'rovide adevice which will instantly give the proper side and edge miters necessary to frame the ridge and valley rafters of a given roof and'which will also indicate the prope-r length for cutting the rafters for-any desired span.

Another object is to so construct the device that it will be economicaito manufacture; r'ug- .ged in construction, and easy to use.

.Other' objects and "advantagesweside. in the detailed construction of theinvention, which is designed for simplicity, economy, andjeffic'iency.

These will become moreapparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing. V

In the drawing:- V Figure, 1 is a front face view rafter marking squarej Figure 2 is a similar view illustrating the rea face thereof. 7

Figure 3 is a top View thereof.

of the improved Figure 4 is a cross section therethrough taken on the vertical center line.

There are three standard pitches for the ordinary pitch roof, that is, one-quarter. pitch, one-third, and one-half pitch and, although the present invention can be made to suit roofs of any desired pitch, it is preferred to manufacture it in thetwo standard pitches, one-quarter.

The drawing illustrates the form for a one- The invention comprises a faceplate I, the lower portion of whichhas a specifictriangular form, to be later described, and the upper portion of which forms a straight edge I, provided with scales 8 marked off in inches; and fractions thereof.

A squaring plate 3 projects outwardly from one face of the plate I. The plate 3 may be secured one-third and tam plate I inany' desired'manner o te an in'tegral partsthereof e-if desired. A illus- 2,000) j 1 v I w a V i 7 summers w k ,7 wa e; mclauflinibnv r, E Application livovember g.

(eta-1 1 2)? through i and riveted in suitable openlngs in "the straight edge "I.

The triangular portion: of the 1 plate l "is formed f with two similarly inclined edges 9 each which forms an angle with the' s'quaring plate-3 equal to the plumb or ridgean' gle or: a rafterihaving 4 3 pitch: Two inclined slots-"1 are formed amine triangular portionof the' face plate.'- ;;These"slot's 7' V form an .angle with the squaring plate to the angle of. the: main orpiumb cut o'n ai qhip or valley; rafter in a' roof having -apitchf The squaringplatet also contains two pai an an'gle with'the fface plate 'I O- e'qu'aL t'ofthe bevelor edge cutlori :the upper end of a rafter; .The other pair of -slots iform an an'gle withthe face plate equal to the hipor'valley'rafter To mark the position of the sawcuton the.

of inclined slots." Ihe-firstorouter pair 4 form} upper extremity of a common or jack rafter, the I squaring plate 3.is placed against the upper edge of the rafter at the. mark indicating the long side thereof, and a mark. is drawn across'the rafter along the inclined side- 9. This gives the exact position for the top or plumb cut of I the ordinary rafter. Should the rafter come against r a hip'or valley rafter, it will of course be necessary to make abevel cut in addition to the.

plumb. cut.

obtained by marking the edge of therafter along the slot 5. Since the device carries similar The mark for this bevel cut is obtained by marking along the slot 4; For hip or valley rafters, the 'plumb out is obtained by marking along the slot 2, andthe bevel'cut is edges and similar slots on both sides of its,

centerline, the devicecan be used for marking:

the rafters on both-sides of the ridge.

The device is also useful for markingthef plate and gutternotches. In marking theplate notch, the squaring plate 3 is placed against the drawn along the proper edge 9. The intersection of the plumb mark with the depth mark will give the point of the notch. The corners 'of' the squaring. plate are rectangular and are used as a square to obtain the horizontal cut mark of the notch. The same procedure is used for hip or valley rafters except that the slots 2 are used for obtaining the plumb cut or vertical mark.

It will be noted that the diagonal edges 9 and the slots 2 carry key numbers, the number on the diagonal edges being 14.42 and the number on the diagonal slots being 18.76. These numbers are used for obtaining the proper length to cut any desired rafter, and are obtained mathematically. from the angle formed by the given roof pitch. The numbers illustrated are for a pitch roof for which the illus-,

trated device is intended. To use the key nutribers, the mechanic multiplies I the horizontal distance in feet between the ridgeofthe roof and the plate upon which the lower extremity of the rafters is to rest or /2 the roof'span by.

the key number.- This will give him the exact length in inches from the apex of the rafter to the, vertical plumb mark of the plate notch. For main rafters, the key number on the diagonal sides is used. For hip and valley rafters' the key numberon the diagonal slots is used.

7 While a specific form of the improvement has been described and illustrated herein,'it'is desired to be understood that the samemay be varied, within thescope of the appended claims, without departing fromthe spirit of the inven- "tlon Having thus described the invention, what is claimed and desired secured by Letters Patent other, each of said edges forming an angle with said face plate equal to the bevel cut on a rafter of a certain given pitch; and a second pair of diagonal edges formed in said squaring plate, each of said second pair of edges forming an angle with the face plate equal to the bevel cut on hip and valley rafters of the same specific pitch.

2. A rafter marking device comprising: a face plate; a squaring plate projecting at right angles from the rear face of said face plate; a pair of diagonal, opposite edges on said face plate, each of said'edges forming an angle with said squaring plate equal to the proper plumb cut for a rafter of a given pitch; a pair of diagonal edges formed in said squaring plate and inclined toward each other, each of said edges forming an angle with said face plate equal to the bevel cut on a rafter of a certain given pitch.

3. A rafter, marking device comprising: a face plate; a squaring plate projecting at right angles from the rear face of said face plate; a pair of diagonal, opposite edges on said faceplate, each ,of said edges forming an angle with said squaring plate to the proper plumb cut for a rafter of a given pitch, and a second pair'of edges inset from said first pair, each of second pair of edges forming an angle with said squaring plate equal to the angle of the plumb cut on hip and valley rafters of the same given pitch; and a second pair of diagonal edges formed in, said squaring plate, each of second pair of edges forming an angle with the face plate equal to the bevel cut on hip and valley rafters of the same specific pitch. 7 a

' 4. A rafter marking device comprising: a face plate; a squaring plate projecting at right angles from the rear face of said face plate; a pair ofdiagonal, opposite edges on said face plate, each of said edges forming an angle with'said squaring plate equal to the proper plumb cut for a rafter of a given pitch; the width of said squaring plate being, equal to the depth of the plate notches in said rafters.

JOHN R. McGLAUFLIN. 

